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Saturday, January 4, 2014

The NZ Tuatara - a reptile resembling a lizard but originating 200 million years ago from the earliest diapsids group...

A Tuatara in Karori Wildlife Sanctuary, Wellin...
A Tuatara in Karori Wildlife Sanctuary, Wellington, New Zealand. (Photo credit: Wikipedia)
Tuatara
Temporal range: Early Cretaceous – Recent,
106–0Ma
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Male northern tuatara (Sphenodon punctatus)
Scientific classificatione
Kingdom:Animalia
Phylum:Chordata
Clade:Sauropsida
Order:Rhynchocephalia
Family:Sphenodontidae
Subfamily:Sphenodontinae
Genus:Sphenodon
Gray, 1831
Type species
Sphenodon punctatus
Evans, 1980
Species
  • S. punctatus (Gray, 1842)
  • S. guntheri Buller, 1877
  • S. diversum Colenso, 1885
dark red: range (New Zealand)
The tuatara is a reptile that is endemic to New Zealand and which, though it resembles most lizards, is part of a distinct lineage, orderRhynchocephalia.[1] The two species of tuatara are the only surviving members of its order, which flourished around 200 million years ago.[2] Their most recent common ancestor with any other extant group is with the squamates (lizards and snakes). For this reason, tuatara are of great interest in the study of the evolution of lizards and snakes, and for the reconstruction of the appearance and habits of the earliest diapsids (the group that also includes birdsdinosaurs, and crocodiles).
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